Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-3-1; IC 13-18-4-1

Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-2

Sec. 23. Grouting materials and the installation of grouting materials must comply with the following:

(1) Grouting materials must consist of the following:

(A) Neat cement grout must consist of cement conforming to ASTM C150M-22 Standard Specification for Portland Cement, as revised July 26, 2022*, and contain at least two percent (2%), but not more than five percent (5%), by weight of bentonite additive.

(B) Bentonite slurry that can include polymers designed to retard swelling.

(C) Pelletized, granular, medium-grade, or coarse-grade crushed bentonite.

(D) Concrete grout must consist of equal amounts of:

(i) cement, conforming to A100-20 AWWA Standard for Water Wells, effective December 31, 2023**; and

(ii) sand mixed with the addition of water to make a mixture not exceeding six (6) gallons of water per one (1) cubic foot of cement;

and contain at least two percent (2%), but not more than five percent (5%), by weight of bentonite additive.

(2) The installation of grouting materials must be in accordance with the following:

(A) Except as provided in section 21(2) of this rule, neat cement and bentonite slurry must be pressure pumped into place with a grout pipe from the bottom of the annular space upward in a continuous operation.

(B) Pelletized, granular, medium-grade, or coarse-grade crushed bentonite must be introduced in a manner to prevent bridging of the borehole annulus.

(C) Concrete grout must be installed according to one (1) of the following:

(i) Pressure pumped.

(ii) Placed by gravity through a grout pipe from the bottom of the annular space upward in a continuous operation.

(iii) Introduced in a manner to prevent bridging of the borehole annulus.

(3) The annulus of a well must be grouted with one (1) of the types of grout specified in subdivision (1) and in accordance with the applicable grout installation methods specified in subdivision (2), with the exception of a prohibition against using the method described in subdivision (2)(C)(iii) if:

(A) the diameter of the borehole is eight (8) inches or larger than the outside diameter of the well casing; and

(B) the well is equal to or less than one hundred (100) feet in depth.

(4) The annulus of a well must be pressure grouted with neat cement, concrete grout, or a bentonite slurry if:

(A) the diameter of the borehole is less than eight (8) inches larger than the outside diameter of the well casing; or

(B) the well is greater than one hundred (100) feet in depth.

(5) The annulus of a well may be grouted, with concrete grout containing gravel not larger than one-half (1/2) inch in size, by using gravity without the use of a grout pipe if:

(A) the diameter of the borehole is greater than twelve (12) inches larger than the outside diameter of the well casing; and

(B) the depth to be grouted is equal to or less than ten (10) feet.

(6) Grouting of the borehole annulus must be accomplished on the earlier of the following events:

(A) Within twenty-four (24) hours after the installation of the well casing.

(B) The removal of drilling equipment from the proposed well location.

(7) All work on the well must stop during the grout setup time specified by the grout material supplier.

*This document is incorporated by reference. Copies of this standard may be obtained from the American Society for Testing and Materials, 1916 Race Street, Philadelphia, PA 19103 or from the Indiana Department of Environmental Management, Office of Water Quality, Indiana Government Center North, 100 North Senate Avenue, Room N1255, Indianapolis, IN 46204.

**This document is incorporated by reference. Copies of this standard may be obtained from the American Water Works Association, 6666 West Quincy Avenue, Denver, CO 80235 or from the Indiana Department of Environmental Management, Office of Legal Counsel, Indiana Government Center North, Thirteenth Floor, 100 North Senate Avenue, Indianapolis, IN 46204.

(Water Pollution Control Division; 327 IAC 8-3.4-23; filed Jun 17, 1999, 1:50 p.m.: 22 IR 3376; readopted filed Jan 10, 2001, 3:23 p.m.: 24 IR 1518; errata filed Feb 6, 2006, 11:15 a.m.: 29 IR 1937; filed Apr 24, 2006, 3:00 p.m.: 29 IR 2968; readopted filed Nov 21, 2007, 1:16 p.m.: 20071219-IR-327070553BFA; readopted filed Jul 29, 2013, 9:21 a.m.: 20130828-IR-327130176BFA; readopted filed Jun 14, 2019, 1:59 p.m.: 20190710-IR-327190246BFA; readopted filed Oct 18, 2024, 1:57 p.m.: 20241113-IR-327230810RFA; filed Nov 24, 2025, 9:07 a.m.: 20251224-IR-327240428FRA)